My Inquiry
My Account
Infineon Technologies CY7C199C-20VC
- Part No.:
- CY7C199C-20VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199C-20VC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C199C-20VC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 20 ns access time, 5.0V ±10% supply range, TTL-compatible I/Os, automatic CE-controlled power-down, and 2.0V data retention. It serves as a nonvolatile buffer or working memory in legacy industrial controllers, telecom line cards, and embedded instrumentation requiring deterministic read/write timing without refresh overhead.
For engineers reviewing the CY7C199C-20VC datasheet, CY7C199C-20VC pinout, CY7C199C-20VC application, or CY7C199C-20VC equivalent, key selection criteria include access time consistency across temperature, low standby current under CE deassertion, pin-compatible drop-in replacement capability in 28-pin DIP/SOJ/TSOP I footprints, and compatibility with 5V TTL bus interfaces.
Technical Context
The CY7C199C-20VC implements a fully asynchronous SRAM architecture with independent address latch, sense amplifier, and output enable control. Its CE-driven power-down circuit reduces ICC to 10 µA when chip enable is inactive, while maintaining data integrity down to 2.0V VCC.
All timing parameters-including tAA (20 ns), tRC (20 ns), tHZOE (9 ns), and tPD (20 ns)-are guaranteed over commercial (0°C to 70°C) and industrial (–40°C to 85°C) temperature ranges at 5.0V ±10%. Input thresholds (VIH = 2.2V, VIL = 0.8V) and output drive (IOH = –4 mA, IOL = 8 mA) ensure robust interoperability with legacy 5V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data interface compatible with 8-bit microcontrollers and legacy bus architectures |
| Access Time (tAA) | 20 ns - guarantees deterministic read latency for real-time control loops and burst-mode data capture |
| VCC Operating Range | 4.5V to 5.5V - supports stable operation across noisy 5V power rails common in industrial backplanes |
| Standby Current (ISB2) | 10 µA - enables ultra-low-power hold mode during system sleep without external power gating |
| Data Retention Voltage | 2.0V - preserves stored contents during brown-out conditions or battery-backed backup scenarios |
| Output Drive Strength | IOL = 8.0 mA / IOH = –4.0 mA - directly drives standard TTL loads without buffering in legacy designs |
| Input Capacitance | 8 pF - minimizes signal integrity degradation on high-speed address/data buses |
Pinout & Package
Package: 28-pin Plastic Dual In-line Package (DIP), 6.9 mm × 35.6 mm × 3.5 mm body size, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K-word space; latched internally on CE/WE transitions |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface with high-impedance state controlled by OE and CE; supports shared bus topology |
| CE | Chip Enable | Active-low master select; initiates automatic power-down when high, enabling zero-refresh standby |
| OE | Output Enable | Active-low control for data output drivers; decouples read data from bus without affecting internal state |
| WE | Write Enable | Active-low write strobe; combined with CE defines write cycle boundaries per JEDEC-standard timing |
| VCC | Power Supply | +5.0V ±10% core supply; powers all logic and memory array; requires local 0.1 µF bypass |
| VSS | Ground | Reference return path for all signals and power; must be low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| 20 ns Access Time | Guaranteed tAA and tRC at 20 ns ensures compatibility with 50 MHz bus clocks in legacy 80Cxx and Z80-based systems |
| Automatic CE Power-down | Reduces ICC to 10 µA when CE is high-eliminates need for external power management circuitry in intermittent-access applications |
| 2.0V Data Retention | Maintains valid data at VCC ≥ 2.0V, supporting seamless transition to battery backup or brown-out recovery without data loss |
| TTL-Compatible I/O | VIH = 2.2V / VIL = 0.8V input thresholds and 8 mA sink capability allow direct interfacing with 74LS/ALS logic families |
| Three Package Options | 28-pin DIP, SOJ, and TSOP I footprints enable design reuse across prototyping, through-hole production, and space-constrained PCB layouts |
Applications
| Industrial PLC Memory Buffer | Telecom Line Card Data Cache |
|---|---|
|
Use Scenario: Storing real-time I/O status and configuration registers in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing deterministic 20 ns read/write cycles synchronized to discrete control logic, not CPU clock. Use Value: Eliminates DRAM refresh overhead and guarantees data coherency during voltage sags down to 2.0V via built-in retention mode. |
Use Scenario: Caching framing alignment words and channel status in T1/E1 line interface units where bus arbitration delays vary unpredictably. IC Role / Device Role / Timing Role: Standalone memory node on shared 5V TTL bus, selected only during frame sync windows to avoid contention. Use Value: 10 µA ISB2 current draw during idle periods extends thermal margin and reduces board-level power dissipation in dense line cards. |
| Legacy Medical Instrumentation | Avionics Display Controller Buffer |
|
Use Scenario: Holding waveform sample buffers and calibration coefficients in portable ECG monitors with battery-backed operation. IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory accessed by 8-bit microcontroller via dedicated address/data bus; retains data during power cycling. Use Value: 2.0V data retention allows safe shutdown during battery swap without losing critical calibration data or patient history. |
Use Scenario: Storing pixel map segments for segmented LCD displays in cockpit display units subject to wide ambient temperature swings. IC Role / Device Role / Timing Role: Static frame buffer mapped into microcontroller's external memory space; accessed only during display update intervals. Use Value: Guaranteed operation from –40°C to +85°C with no timing derating ensures consistent display update latency across flight envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-20TQLI | 32K × 16 organization, 3.3V-only supply, 20 ns access, LVCMOS I/O levels | Requires bus width adaptation (16-bit vs. 8-bit) and level-shifting for 5V systems | Select only if migrating to 3.3V architecture and redesigning data path width |
| ON Semiconductor MCM6295DWX | 32K × 8, 5V, 25 ns access, higher ICC (100 mA), no 2.0V retention | Larger tAA increases worst-case interrupt latency; lacks low-VCC data hold capability | Acceptable for cost-sensitive non-battery-backed applications where 25 ns timing is acceptable |
Compared with IS61LV25616AL-20TQLI and MCM6295DWX, the CY7C199C-20VC uniquely combines 5V TTL compatibility, 20 ns timing, and 2.0V data retention-making it irreplaceable in legacy 5V systems requiring guaranteed brown-out resilience and pin-for-pin fit.
Availability
CY7C199C-20VC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, telecom line card data caches, and legacy medical instrumentation requiring stable component supply across extended product lifecycles.
Supply support for CY7C199C-20VC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, designed specifically for drop-in replacement of obsolete 28-pin 5V SRAMs in long-lifecycle industrial and telecom equipment.
FAQ
Is CY7C199C-20VC RoHS-compliant?
Yes. The CY7C199C-20VC is manufactured in a lead-free 28-pin DIP package compliant with RoHS Directive 2011/65/EU. Lead-free finish uses matte tin plating over copper leads, with maximum lead content below 1000 ppm by weight.
What is the maximum junction temperature for continuous operation?
The maximum junction temperature (TJ) is +125°C. This is derived from the device's ΘJA of 79°C/W (SOJ) and 88.6°C/W (TSOP I), with derating applied per JEDEC JESD51-2. At 85°C ambient and 75 mA ICC, TJ remains within safe limits.
Can CY7C199C-20VC operate with mixed 3.3V and 5V logic interfaces?
No. The CY7C199C-20VC requires a 4.5V–5.5V VCC supply and has TTL-compatible inputs (VIH = 2.2V min). Direct connection to 3.3V logic outputs violates VIH specification and risks unreliable reads; level translation is mandatory.
Does the automatic power-down feature require external circuitry?
No. Power-down is fully internal and triggered solely by CE ≥ VIH. When CE is high, the device automatically enters low-current mode drawing ≤10 µA, with no external control signals, timers, or power switches needed.
CY7C199C-20VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C199C-20VC FAQ
1.How can I place an order for CY7C199C-20VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-20VC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY7C199C-20VC reliable?
The price and inventory of CY7C199C-20VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-20VC is usually 5 days.
3.What payment methods are accepted for CY7C199C-20VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-20VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-20VC?
CY7C199C-20VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-20VC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY7C199C-20VC?
For technical support, including CY7C199C-20VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-20VC requirements.
6.How does Aetrix verify that CY7C199C-20VC is sourced from the original manufacturer or authorized distributors?
All CY7C199C-20VC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C199C-20VC meets industry standards.
7.What is the process for return or replacement of CY7C199C-20VC?
All CY7C199C-20VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-20VC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY7C199C-20VC part is unused and in its original packaging.
Return procedure for CY7C199C-20VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199C-20VC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
